LM317SX/NOPB - NATIONAL SEMICONDUCTOR

LM117/LM317A/LM317

March 1, 2010

3-Terminal Adjustable Regulator

General Description

The LM117 series of adjustable 3-terminal positive voltage

regulators is capable of supplying in excess of 1.5A over a

1.2V to 37V output range. They are exceptionally easy to use

and require only two external resistors to set the output volt-

age. Further, both line and load regulation are better than

standard fixed regulators. Also, the LM117 is packaged in

standard transistor packages which are easily mounted and

handled.

In addition to higher performance than fixed regulators, the

LM117 series offers full overload protection available only in

IC's. Included on the chip are current limit, thermal overload

protection and safe area protection. All overload protection

circuitry remains fully functional even if the adjustment termi-

nal is disconnected.

Normally, no capacitors are needed unless the device is sit-

uated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An optional output ca-

pacitor can be added to improve transient response. The

adjustment terminal can be bypassed to achieve very high

ripple rejection ratios which are difficult to achieve with stan-

dard 3-terminal regulators.

Besides replacing fixed regulators, the LM117 is useful in a

wide variety of other applications. Since the regulator is “float-

ing” and sees only the input-to-output differential voltage,

supplies of several hundred volts can be regulated as long as

the maximum input to output differential is not exceeded, i.e.,

avoid short-circuiting the output.

Also, it makes an especially simple adjustable switching reg-

ulator, a programmable output regulator, or by connecting a

fixed resistor between the adjustment pin and output, the

LM117 can be used as a precision current regulator. Supplies

with electronic shutdown can be achieved by clamping the

adjustment terminal to ground which programs the output to

1.2V where most loads draw little current.

For applications requiring greater output current, see LM150

series (3A) and LM138 series (5A) data sheets. For the neg-

ative complement, see LM137 series data sheet.

Features

■Guaranteed 1% output voltage tolerance (LM317A)

■Guaranteed max. 0.01%/V line regulation (LM317A)

■Guaranteed max. 0.3% load regulation (LM117)

■Guaranteed 1.5A output current

■Adjustable output down to 1.2V

■Current limit constant with temperature

■P+ Product Enhancement tested

■80 dB ripple rejection

■Output is short-circuit protected

Typical Applications

1.2V–25V Adjustable Regulator

906301

Full output current not available at high input-output voltages

*Needed if device is more than 6 inches from filter capacitors.

†Optional—improves transient response. Output capacitors in the range

of 1μF to 1000μF of aluminum or tantalum electrolytic are commonly used

to provide improved output impedance and rejection of transients.

LM117/LM317A/LM317 Package Options

Part

Number Suffix Package Output

Current

LM117, LM317 K TO-3 1.5A

LM317A, LM317 T TO-220 1.5A

LM317 S TO-263 1.5A

LM317A, LM317 EMP SOT-223 1.0A

LM117, LM317A, LM317 H TO-39 0.5A

LM117 E LCC 0.5A

LM317A, LM317 MDT TO-252 0.5A

SOT-223 vs. TO-252 (D-Pak)

Packages

906354

Scale 1:1

LM117/LM317A/LM317 3-Terminal Adjustable Regulator

Connection Diagrams

TO-3 (K)

Metal Can Package

906330

CASE IS OUTPUT

Bottom View

Steel Package

NS Package Number K02A or K02C

TO-39 (H)

Metal Can Package

906331

CASE IS OUTPUT

Bottom View

NS Package Number H03A

TO-263 (S)

Surface-Mount Package

906335

Top View

TO-220 (T)

Plastic Package

906332

Front View

NS Package Number T03B

TO-263 (S)

Surface-Mount Package

906336

Side View

NS Package Number TS3B

Ceramic Leadless

Chip Carrier (E)

906334

Top View

NS Package Number E20A

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LM117/LM317A/LM317

4-Lead SOT-223 (EMP)

906359

Front View

NS Package Number MP04A

TO-252 (MDT)

906366

Front View

NS Package Number TD03B

Ordering Information

Package Temperature

Range

Output

Current

Order

Number

Package

Marking

Transport

Media

NSC

Drawing

TO-3

Metal Can

(K)

−55°C ≤ TJ ≤ +150°C 1.5A LM117K STEEL LM117K STEEL P+ 50 Per Bag K02A

0°C ≤ TJ ≤ +125°C 1.5A LM317K STEEL LM317K STEEL P+ 50 Per Bag

−55°C ≤ TJ ≤ +150°C 1.5A LM117K/883 LM117K/883 50 Per Bag K02C

TO-220

3- Lead

−40°C ≤ TJ ≤ +125°C 1.5A LM317AT LM317AT P+ 45 Units/Rail T03B

0°C ≤ TJ ≤ +125°C 1.5A LM317T LM317T P+ 45 Units/Rail

TO-263

3- Lead 0°C ≤ TJ ≤ +125°C 1.5A LM317S LM317S P+ 45 Units/Rail TS3B

LM317SX 500 Units Tape and Reel

SOT-223

4- Lead

0°C ≤ TJ ≤ +125°C 1.0A LM317EMP N01A 1k Units Tape and Reel

MP04A

LM317EMPX 2k Units Tape and Reel

−40°C ≤ TJ ≤ +125°C 1.0A LM317AEMP N07A 1k Units Tape and Reel

LM317AEMPX 2k Units Tape and Reel

TO-39

Metal Can

(H)

−55°C ≤ TJ ≤ +150°C 0.5A LM117H LM117H P+ 500 Per Box

H03A

−55°C ≤ TJ ≤ +150°C 0.5A LM117H/883 LM117H/883 20 Per Tray

−40°C ≤ TJ ≤ +125°C 0.5A LM317AH LM317AH P+ 500 Per Box

0°C ≤ TJ ≤ +125°C 0.5A LM317H LM317H P+ 500 Per Box

LCC −55°C ≤ TJ ≤ +150°C 0.5A LM117E/883 LM117E/883 50 Units/Rail E20A

TO-252

3- Lead

D-Pack

0°C ≤ TJ ≤ +125°C 0.5A LM317MDT LM317MDT 75 Units/Rail

TD03B

LM317MDTX 2.5k Units Tape and Reel

−40°C ≤ TJ ≤ +125°C 0.5A LM317AMDT LM317AMDT 75 Units/Rail

LM317AMDTX 2.5k Units Tape and Reel

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LM117/LM317A/LM317

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Power Dissipation Internally Limited

Input-Output Voltage Differential +40V, −0.3V

Storage Temperature −65°C to +150°C

Lead Temperature

Metal Package (Soldering, 10 seconds) 300°C

Plastic Package (Soldering, 4 seconds) 260°C

ESD Tolerance (Note 5) 3 kV

Operating Temperature Range

LM117 −55°C ≤ TJ ≤ +150°C

LM317A −40°C ≤ TJ ≤ +125°C

LM317 0°C ≤ TJ ≤ +125°C

Preconditioning

Thermal Limit Burn-In All Devices 100%

LM117 Electrical Characteristics (Note 3)

Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature

Range. Unless otherwise specified, VIN − VOUT = 5V, and IOUT = 10 mA.

Parameter Conditions LM117 (Note 2)

Min Typ Max Units

Reference Voltage 3V ≤ (VIN − VOUT) ≤ 40V,

10 mA ≤ IOUT ≤ IMAX

1.20 1.25 1.30 V

Line Regulation 3V ≤ (VIN − VOUT) ≤ 40V (Note 4) 0.01

0.02

0.05 %/V

Load Regulation 10 mA ≤ IOUT ≤ IMAX (Note 4) 0.1

0.3

Thermal Regulation 20 ms Pulse 0.03 0.07 %/W

Adjustment Pin Current 50 100 μA

Adjustment Pin Current Change 10 mA ≤ IOUT ≤ IMAX

3V ≤ (VIN − VOUT) ≤ 40V 0.2 5 μA

Temperature Stability TMIN ≤ TJ ≤ TMAX 1 %

Minimum Load Current (VIN − VOUT) = 40V 3.5 5 mA

Current Limit

(VIN − VOUT) ≤ 15V

K Package

H, E Package

1.5

0.5

2.2

0.8

3.4

1.8 A

(VIN − VOUT) = 40V

K Package

H, E Package

0.3

0.15

0.4

0.20 A

RMS Output Noise, % of VOUT 10 Hz ≤ f ≤ 10 kHz 0.003 %

Ripple Rejection Ratio VOUT = 10V, f = 120 Hz, CADJ = 0 μF 65 dB

VOUT = 10V, f = 120 Hz, CADJ = 10 μF66 80 dB

Long-Term Stability TJ = 125°C, 1000 hrs 0.3 1 %

Thermal Resistance, θJC

Junction-to-Case

K (TO-3) Package

H (TO-39) Package

E (LCC) Package

°C/W

Thermal Resistance, θJA

Junction-to-Ambient

(No Heat Sink)

K (TO-3) Package

H (TO-39) Package

E (LCC) Package

186

°C/W

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LM117/LM317A/LM317

LM317A and LM317 Electrical Characteristics (Note 3)

Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature

Range. Unless otherwise specified, VIN − VOUT = 5V, and IOUT = 10 mA.

Parameter Conditions LM317A LM317

Min Typ Max Min Typ Max Units

Reference Voltage

1.238 1.250 1.262 - 1.25 - V

3V ≤ (VIN − VOUT) ≤ 40V,

10 mA ≤ IOUT ≤ IMAX

1.225 1.250 1.270 1.20 1.25 1.30 V

Line Regulation 3V ≤ (VIN − VOUT) ≤ 40V (Note 4) 0.005

0.01

0.02 0.01

0.02

0.04

0.07 %/V

Load Regulation 10 mA ≤ IOUT ≤ IMAX (Note 4) 0.1

0.3

0.5

1 0.1

0.3

0.5

1.5 %

Thermal Regulation 20 ms Pulse 0.04 0.07 0.04 0.07 %/W

Adjustment Pin Current 50 100 50 100 μA

Adjustment Pin Current Change 10 mA ≤ IOUT ≤ IMAX

3V ≤ (VIN − VOUT) ≤ 40V 0.2 5 0.2 5 μA

Temperature Stability TMIN ≤ TJ ≤ TMAX 1 1 %

Minimum Load Current (VIN − VOUT) = 40V 3.5 10 3.5 10 mA

Current Limit

(VIN − VOUT) ≤ 15V

K, T, S Packages

EMP Package

H, MDT Packages

1.5

0.5

2.2

0.8

3.4

1.8

1.5

0.5

2.2

0.8

3.4

1.8

(VIN − VOUT) = 40V

K, T, S Packages

EMP Package

H, MDT Packages

0.112

0.075

0.30

0.20

0.15

0.112

0.075

0.40

0.30

0.20

RMS Output Noise, % of VOUT 10 Hz ≤ f ≤ 10 kHz 0.003 0.003 %

Ripple Rejection Ratio VOUT = 10V, f = 120 Hz, CADJ = 0 μF 65 65 dB

VOUT = 10V, f = 120 Hz, CADJ = 10 μF66 80 66 80 dB

Long-Term Stability TJ = 125°C, 1000 hrs 0.3 1 0.3 1 %

Thermal Resistance, θJC

Junction-to-Case

K (TO-3) Package

T (TO-220) Package

S (TO-263) Package

EMP (SOT-223) Package

H (TO-39) Package

MDT (TO-252) Package

23.5

°C/W

Thermal Resistance, θJA

Junction-to-Ambient

(No Heat Sink)

K (TO-3) Package

T (TO-220) Package

S (TO-263) Package (Note 6)

EMP (SOT-223) Package (Note 6)

H (TO-39) Package

MDT (TO-252) Package (Note 6)

140

186

103

140

186

103

°C/W

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

The guaranteed specifications apply only for the test conditions listed.

Note 2: Refer to RETS117H drawing for the LM117H, or the RETS117K for the LM117K military specifications.

Note 3: IMAX = 1.5A for the K (TO-3), T (TO-220), and S (TO-263) packages. IMAX = 1.0A for the EMP (SOT-223) package. IMAX = 0.5A for the H (TO-39), MDT

(TO-252), and E (LCC) packages. Device power dissipation (PD) is limited by ambient temperature (TA), device maximum junction temperature (TJ), and package

thermal resistance (θJA). The maximum allowable power dissipation at any temperature is : PD(MAX) = ((TJ(MAX) - TA)/θJA). All Min. and Max. limits are guaranteed

to National's Average Outgoing Quality Level (AOQL).

Note 4: Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects

are covered under the specifications for thermal regulation.

Note 5: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

Note 6: When surface mount packages are used (TO-263, SOT-223, TO-252), the junction to ambient thermal resistance can be reduced by increasing the PC

board copper area that is thermally connected to the package. See the Applications Hints section for heatsink techniques.

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LM117/LM317A/LM317

Typical Performance Characteristics Output Capacitor = 0 μF unless otherwise noted

Load Regulation

906337

Current Limit

906338

Adjustment Current

906339

Dropout Voltage

906340

VOUT vs VIN, VOUT = VREF

906367

VOUT vs VIN, VOUT = 5V

906368

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LM117/LM317A/LM317

Temperature Stability

906341

Minimum Operating Current

906342

Ripple Rejection

906343

Ripple Rejection

906344

Ripple Rejection

906345

Output Impedance

906346

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LM117/LM317A/LM317

Line Transient Response

906347

Load Transient Response

906348

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LM117/LM317A/LM317

Application Hints

In operation, the LM117 develops a nominal 1.25V reference

voltage, VREF, between the output and adjustment terminal.

The reference voltage is impressed across program resistor

R1 and, since the voltage is constant, a constant current I1

then flows through the output set resistor R2, giving an output

voltage of

(1)

906305

FIGURE 1.

Since the 100μA current from the adjustment terminal repre-

sents an error term, the LM117 was designed to minimize

IADJ and make it very constant with line and load changes. To

do this, all quiescent operating current is returned to the out-

put establishing a minimum load current requirement. If there

is insufficient load on the output, the output will rise.

EXTERNAL CAPACITORS

An input bypass capacitor is recommended. A 0.1μF disc or

1μF solid tantalum on the input is suitable input bypassing for

almost all applications. The device is more sensitive to the

absence of input bypassing when adjustment or output ca-

pacitors are used but the above values will eliminate the

possibility of problems.

The adjustment terminal can be bypassed to ground on the

LM117 to improve ripple rejection. This bypass capacitor pre-

vents ripple from being amplified as the output voltage is

increased. With a 10 μF bypass capacitor 80dB ripple rejec-

tion is obtainable at any output level. Increases over 10 μF do

not appreciably improve the ripple rejection at frequencies

above 120Hz. If the bypass capacitor is used, it is sometimes

necessary to include protection diodes to prevent the capac-

itor from discharging through internal low current paths and

damaging the device.

In general, the best type of capacitors to use is solid tantalum.

Solid tantalum capacitors have low impedance even at high

frequencies. Depending upon capacitor construction, it takes

about 25 μF in aluminum electrolytic to equal 1μF solid tan-

talum at high frequencies. Ceramic capacitors are also good

at high frequencies; but some types have a large decrease in

capacitance at frequencies around 0.5 MHz. For this reason,

0.01 μF disc may seem to work better than a 0.1 μF disc as

a bypass.

Although the LM117 is stable with no output capacitors, like

any feedback circuit, certain values of external capacitance

can cause excessive ringing. This occurs with values be-

tween 500 pF and 5000 pF. A 1 μF solid tantalum (or 25 μF

aluminum electrolytic) on the output swamps this effect and

insures stability. Any increase of the load capacitance larger

than 10 μF will merely improve the loop stability and output

impedance.

LOAD REGULATION

The LM117 is capable of providing extremely good load reg-

ulation but a few precautions are needed to obtain maximum

performance. The current set resistor connected between the

adjustment terminal and the output terminal (usually 240Ω)

should be tied directly to the output (case) of the regulator

rather than near the load. This eliminates line drops from ap-

pearing effectively in series with the reference and degrading

regulation. For example, a 15V regulator with 0.05Ω resis-

tance between the regulator and load will have a load regu-

lation due to line resistance of 0.05Ω × IL. If the set resistor is

connected near the load the effective line resistance will be

0.05Ω (1 + R2/R1) or in this case, 11.5 times worse.

Figure 2 shows the effect of resistance between the regulator

and 240Ω set resistor.

906306

FIGURE 2. Regulator with Line Resistance in Output Lead

With the TO-3 package, it is easy to minimize the resistance

from the case to the set resistor, by using two separate leads

to the case. However, with the TO-39 package, care should

be taken to minimize the wire length of the output lead. The

ground of R2 can be returned near the ground of the load to

provide remote ground sensing and improve load regulation.

PROTECTION DIODES

When external capacitors are used with any IC regulator it is

sometimes necessary to add protection diodes to prevent the

capacitors from discharging through low current points into

the regulator. Most 10 μF capacitors have low enough internal

series resistance to deliver 20A spikes when shorted. Al-

though the surge is short, there is enough energy to damage

parts of the IC.

When an output capacitor is connected to a regulator and the

input is shorted, the output capacitor will discharge into the

output of the regulator. The discharge current depends on the

value of the capacitor, the output voltage of the regulator, and

the rate of decrease of VIN. In the LM117, this discharge path

is through a large junction that is able to sustain 15A surge

with no problem. This is not true of other types of positive

regulators. For output capacitors of 25 μF or less, there is no

need to use diodes.

The bypass capacitor on the adjustment terminal can dis-

charge through a low current junction. Discharge occurs when

either the input, or the output, is shorted. Internal to the LM117

is a 50Ω resistor which limits the peak discharge current. No

protection is needed for output voltages of 25V or less and 10

μF capacitance. Figure 3 shows an LM117 with protection

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LM117/LM317A/LM317

diodes included for use with outputs greater than 25V and

high values of output capacitance.

906307

(2)

D1 protects against C1

D2 protects against C2

FIGURE 3. Regulator with Protection Diodes

HEATSINK REQUIREMENTS

The LM317 regulators have internal thermal shutdown to pro-

tect the device from over-heating. Under all operating condi-

tions, the junction temperature of the LM317 should not

exceed the rated maximum junction temperature (TJ) of 150°

C for the LM117, or 125°C for the LM317A and LM317. A

heatsink may be required depending on the maximum device

power dissipation and the maximum ambient temperature of

the application. To determine if a heatsink is needed, the

power dissipated by the regulator, PD, must be calculated:

PD = ((VIN − VOUT) × IL) + (VIN × IG) (3)

Figure 4 shows the voltage and currents which are present in

the circuit.

The next parameter which must be calculated is the maximum

allowable temperature rise, TR(MAX):

TR(MAX) = TJ(MAX) − TA(MAX) (4)

where TJ(MAX) is the maximum allowable junction temperature

(150°C for the LM117, or 125°C for the LM317A/LM317), and

TA(MAX) is the maximum ambient temperature which will be

encountered in the application.

Using the calculated values for TR(MAX) and PD, the maximum

allowable value for the junction-to-ambient thermal resistance

(θJA) can be calculated:

θJA = (TR(MAX) / PD) (5)

906360

FIGURE 4. Power Dissipation Diagram

If the calculated maximum allowable thermal resistance is

higher than the actual package rating, then no additional work

is needed. If the calculated maximum allowable thermal re-

sistance is lower than the actual package rating either the

power dissipation (PD) needs to be reduced, the maximum

ambient temperature TA(MAX) needs to be reduced, the ther-

mal resistance (θJA) must be lowered by adding a heatsink,

or some combination of these.

If a heatsink is needed, the value can be calculated from the

formula:

θHA ≤ (θJA - (θCH + θJC)) (6)

where (θCH is the thermal resistance of the contact area be-

tween the device case and the heatsink surface, and θJC is

thermal resistance from the junction of the die to surface of

the package case.

When a value for θ(H−A) is found using the equation shown, a

heatsink must be selected that has a value that is less than,

or equal to, this number.

The θ(H−A) rating is specified numerically by the heatsink man-

ufacturer in the catalog, or shown in a curve that plots tem-

perature rise vs power dissipation for the heatsink.

HEATSINKING SURFACE MOUNT PACKAGES

The TO-263 (S), SOT-223 (EMP) and TO-252 (MDT) pack-

ages use a copper plane on the PCB and the PCB itself as a

heatsink. To optimize the heat sinking ability of the plane and

PCB, solder the tab of the package to the plane.

HEATSINKING THE SOT-223 PACKAGE

Figure 5 and Figure 6 show the information for the SOT-223

package. Figure 6 assumes a θ(J−A) of 74°C/W for 1 ounce

copper and 51°C/W for 2 ounce copper and a maximum junc-

tion temperature of 125°C. Please see AN-1028 for thermal

enhancement techniques to be used with SOT-223 and

TO-252 packages.

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LM117/LM317A/LM317

906357

FIGURE 5. θ(J−A) vs Copper (2 ounce) Area for the

SOT-223 Package

906358

FIGURE 6. Maximum Power Dissipation vs TAMB for the

SOT-223 Package

HEATSINKING THE TO-263 PACKAGE

Figure 7 shows for the TO-263 the measured values of θ(J

−A) for different copper area sizes using a typical PCB with 1

ounce copper and no solder mask over the copper area used

for heatsinking.

As shown in Figure 7, increasing the copper area beyond 1

square inch produces very little improvement. It should also

be observed that the minimum value of θ(J−A) for the TO-263

package mounted to a PCB is 32°C/W.

906355

FIGURE 7. θ(J−A) vs Copper (1 ounce) Area for the TO-263

Package

As a design aid, Figure 8 shows the maximum allowable pow-

er dissipation compared to ambient temperature for the

TO-263 device (assuming θ(J−A) is 35°C/W and the maximum

junction temperature is 125°C).

906356

FIGURE 8. Maximum Power Dissipation vs TAMB for the

TO-263 Package

HEATSINKING THE TO-252 PACKAGE

If the maximum allowable value for θJA is found to be ≥103°

C/W (Typical Rated Value) for TO-252 package, no heatsink

is needed since the package alone will dissipate enough heat

to satisfy these requirements. If the calculated value for θJA

falls below these limits, a heatsink is required.

As a design aid, Table 1 shows the value of the θJA of TO-252

for different heatsink area. The copper patterns that we used

to measure these θJAs are shown at the end of the Application

Notes Section. Figure 9 reflects the same test results as what

are in Table 1.

Figure 10 shows the maximum allowable power dissipation

vs. ambient temperature for the TO-252 device. Figure 11

shows the maximum allowable power dissipation vs. copper

area (in2) for the TO-252 device. Please see AN-1028 for

thermal enhancement techniques to be used with SOT-223

and TO-252 packages.

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LM117/LM317A/LM317

TABLE 1. θJA Different Heatsink Area

Layout Copper Area Thermal Resistance

Top Side (in2)* Bottom Side (in2)(θJA°C/W) TO-252

1 0.0123 0 103

2 0.066 0 87

3 0.3 0 60

4 0.53 0 54

5 0.76 0 52

6 1.0 0 47

7 0.066 0.2 84

8 0.066 0.4 70

9 0.066 0.6 63

10 0.066 0.8 57

11 0.066 1.0 57

12 0.066 0.066 89

13 0.175 0.175 72

14 0.284 0.284 61

15 0.392 0.392 55

16 0.5 0.5 53

Note: * Tab of device attached to topside of copper.

906361

FIGURE 9. θJA vs 2oz Copper Area for TO-252

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LM117/LM317A/LM317

906363

FIGURE 10. Maximum Allowable Power Dissipation vs. Ambient Temperature for TO-252

906362

FIGURE 11. Maximum Allowable Power Dissipation vs. 2oz Copper Area for TO-252

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LM117/LM317A/LM317

906364

FIGURE 12. Top View of the Thermal Test Pattern in Actual Scale

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LM117/LM317A/LM317

906365

FIGURE 13. Bottom View of the Thermal Test Pattern in Actual Scale

Schematic Diagram

906308

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LM117/LM317A/LM317

Typical Applications

5V Logic Regulator with Electronic Shutdown*

906303

*Min. output ≊ 1.2V

Slow Turn-On 15V Regulator

906309

Adjustable Regulator with Improved Ripple Rejection

906310

†Solid tantalum

*Discharges C1 if output is shorted to ground

High Stability 10V Regulator

906311

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LM117/LM317A/LM317

High Current Adjustable Regulator

906312

‡Optional—improves ripple rejection

†Solid tantalum

*Minimum load current = 30 mA

0 to 30V Regulator

906313

Full output current not available at high input-output voltages

Power Follower

906314

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LM117/LM317A/LM317

5A Constant Voltage/Constant Current Regulator

906315

†Solid tantalum

*Lights in constant current mode

1A Current Regulator

906316

1.2V–20V Regulator with Minimum Program Current

906317

*Minimum load current ≊ 4 mA

High Gain Amplifier

906318

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LM117/LM317A/LM317

Low Cost 3A Switching Regulator

906319

†Solid tantalum

*Core—Arnold A-254168-2 60 turns

4A Switching Regulator with Overload Protection

906320

†Solid tantalum

*Core—Arnold A-254168-2 60 turns

Precision Current Limiter

906321

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LM117/LM317A/LM317

Tracking Preregulator

906322

Current Limited Voltage Regulator

906323

(Compared to LM117's higher current limit)

—At 50 mA output only ¾ volt of drop occurs in R3 and R4

Adjusting Multiple On-Card Regulators with Single Control*

906324

*All outputs within ±100 mV

†Minimum load—10 mA

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LM117/LM317A/LM317

AC Voltage Regulator

906325

12V Battery Charger

906326

Use of RS allows low charging rates with fully charged battery.

50mA Constant Current Battery Charger

906327

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LM117/LM317A/LM317

Adjustable 4A Regulator

906328

Current Limited 6V Charger

906329

*Sets peak current (0.6A for 1Ω)

**The 1000μF is recommended to filter out input transients

Digitally Selected Outputs

906302

*Sets maximum VOUT

www.national.com 22

LM117/LM317A/LM317

Physical Dimensions inches (millimeters) unless otherwise noted

TO-3 Metal Can Package (K)

NS Package Number K02A

TO-3 Metal Can Package (K)

Mil-Aero Product

NS Package Number K02C

23 www.national.com

LM117/LM317A/LM317

TO-39 Metal Can Package (H)

NS Package Number H03A

3-Lead TO-220 (T)

NS Package Number T03B

www.national.com 24

LM117/LM317A/LM317

3-Lead TO-263 (S)

NS Package Number TS3B

Ceramic Leadless Chip Carrier (E)

NS Package Number E20A

25 www.national.com

LM117/LM317A/LM317

4-Lead SOT-223 (EMP)

NS Package Number MP04A

3-Lead D-Pack (MDT)

NS Package Number TD03B

www.national.com 26

LM117/LM317A/LM317

Notes

27 www.national.com

LM117/LM317A/LM317

Notes

LM117/LM317A/LM317 3-Terminal Adjustable Regulator

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